Parameter destructuring loses type information

[johnnyreilly]

I've just noticed this problem:

var myBooks = [
    {title: 'Sherlock Holmes'},
    {title: 'Moby Dick'}
];

var bookTitles = myBooks.map(({title}) => title); // Boo!  no type information; title is `any`

So if I use parameter destructuring I lose the type information which is kinda sad.

I can work around it like this:

var bookTitles = myBooks.map(b => {
    const { title } = b;
    return title;
}); 

or this:

var bookTitles = myBooks.map(b => b.title); 

But ideally I shouldn't need to.

[vladima]

dupe of #4937, that was already fixed in master.

[johnnyreilly]

Fantastic - thanks @vladima. Did a little digging through existing issues but didn't spot this.